Re: Eudyptula Challenge

On Mon, May 5, 2014 at 5:58 PM, Mandeep Sandhu wrote: > +1 to this question. > > I too started off early, but now I'm busy with my current work and > paused on the assignments. > > -mandeep > > On Mon, May 5, 2014 at 5:25 PM, Narendra Joshi wrote: >> Will the Eudyptula Challenge be always around?

System shutdown sequence

Hi, When system is going for shutdown, shutdown handler of each device driver is called. Does kernel in this sequence calls remove handler ? I believe that remove is not called if driver is built-in. Is my understanding correct ? Thanks, Rahul ___ Ker

Re: Side effects of open system call

On Thu, Feb 20, 2014 at 9:06 PM, wrote: > On Thu, 20 Feb 2014 20:36:44 +0530, Rahul Bedarkar said: > >> "Often the open(2) call has unwanted side effects, that can be avoided >>under Linux by giving it the O_NONBLOCK flag." >> >> I have seen op

Side effects of open system call

Hi, In ioctl man page, mentioned that "Often the open(2) call has unwanted side effects, that can be avoided under Linux by giving it the O_NONBLOCK flag." I have seen open man page but can't find what are side effects of open. Does anybody know what are side effects of open in general ?

Re: Section Mismatch error

try removing __devinit and __devexit from probe and remove. This is not needed as it is module. On Tue, Jul 30, 2013 at 4:36 PM, Vignesh Radhakrishnan < vignesh1...@gmail.com> wrote: > Hi, > > I am facing the following error when i am building the kernel. > > > ERROR: modpost: Found 2 section mi

CPU usage of particular process

Hi, I am trying to write small program to get CPU usage for a particular process. My logic is to read user, nice, system, idle values from /proc/stat. Then read user and system time from /proc//stat. Then wait for some time and again read same values. After that I am doing following calculations C

Linux kernel book

Hi, Can you suggest book on Linux kernel and device drivers which covers kernel version 3.0 on words? Thanks, Rahul B. ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies

port 1 disabled by hub (EMI?), re-enabling...

Hi, When I remove pen-drive, I am seeing following logs [ 132.968942] Disconnect Detected Interrupt++ (Host) a_host [ 133.196692] hub 1-0:1.0: port 1 disabled by hub (EMI?), re-enabling... [ 133.207595] usb 1-1: USB disconnect, device number 2 [ 164.420649] sd 0:0:0:0: Device offlined - not

Re: Regarding module init function

n 8, 2013 at 11:08 AM, Rahul Bedarkar wrote: > > > > Ok. in init/main.c we call do_basic_setup(). Where do_initcalls call > each of init functions from __early_initcall_end to __initcall_end. But I > don't know from where these values gets initialized. > > If you lo

Re: Regarding module init function

Ok. in init/main.c we call do_basic_setup(). Where do_initcalls call each of init functions from __early_initcall_end to __initcall_end. But I don't know from where these values gets initialized. On Tue, Jan 8, 2013 at 2:10 PM, Rahul Bedarkar wrote: > I have gone through LDD3 page 31

doesn't support DPO or FUA

Hi, When I attach pen-drive, I am seeing following logs. And when I remove pen-drive, file system does not unmount for 10-15 secs. [ 35.183406] usb 1-1: new full-speed USB device number 2 using dwc_otg [ 35.440812] usb 1-1: not running at top speed; connect to a high speed hub [ 35.456740]

Re: Regarding module init function

? Thanks, Rahul On Fri, Jan 4, 2013 at 6:52 PM, Tobias Boege wrote: > On Fri, 04 Jan 2013, Rahul Bedarkar wrote: > > Hi, > > > > This may be stupid question. > > > > When we compile external module and insert it, it's init function is > called > &

Regarding module init function

Hi, This may be stupid question. When we compile external module and insert it, it's init function is called and when we remove it, it's exit function gets called. What happens in case of built-in modules? When it's init and exit is called? May be take example of one of auxdriver. Thanks, Rahu

Re: What is asmlinkage ?

Thanks. So with asmlinkage we request compiler to put args on stack. What is advantage of this to start_kernel or in general to other functions ? Regards, Rahul On Thu, Jan 3, 2013 at 9:34 PM, Mulyadi Santosa wrote: > On Thu, Jan 3, 2013 at 7:40 PM, Rahul Bedarkar wrote: > > Hi, >

sys fs interface

Hi, When driver provides sys fs interface for user space programs, how we specify name of file to be created ? Thanks, Rahul B. ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies

Regarding ioctl()

Hi, When ioctl() is called from user space, how device driver related to it comes into picture ? What is flow from user space to kernel space ? Thanks, Rahul Bedarkar ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http

Regarding udevadm

Hi, I am using udevadm info to get information about connected block devices. I have attached usb device and disabled auto mounting of it. I can see kernel logs that device is added and node is created. But when I use udevadm info --export-db, I can't see device info of /dev/sdb1 If I use udeva

Regarding driver interface for user space

or absolute rotation happened, if these were clockwise or counter clockwise, etc. And in case of touchscreen driver, touch events ? Thanks, Rahul Bedarkar ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org

Re: Compiling the source RPM file.

Can you write command here, how you have applied patches ? Packages (.deb, .rpm and others) meant to build and installed automatically. You can build and install it by following command $sudo rpm -i On Fri, Sep 28, 2012 at 11:51 AM, K Arun Kumar wrote: > I have a rpm for a module which I ext

Re: I/O event notification mechanism - select() or epoll() ?

Thanks Michi and Peter ! On Fri, Sep 28, 2012 at 10:53 AM, wrote: > Hi! > > On 17:19 Wed 26 Sep , Rahul Bedarkar wrote: >> Hi, >> >> I have to capture kernel udev events through libudev. One of API >> provides asynchronous events by reading on file descripto

I/O event notification mechanism - select() or epoll() ?

Hi, I have to capture kernel udev events through libudev. One of API provides asynchronous events by reading on file descriptor. I found that there two ways to do that. 1) select call 2) epoll I also found that epoll is smarter and meant to replace old select call. What are your thoughts on the

Re: Is my rootfs correctly mounted?

> > 2012/8/30 stl >> >> Thanks Rahul for your very quick answer. >> Glad to hear this. >> So, when does the message "VFS: Mounted root" appear? >> Maybe when using init ramdisk (initrd) support? I don't know but if it fails to mount root file system or

Re: Is my rootfs correctly mounted?

yes root file system is mounted correctly. It is just it didn't find init. On Thu, Aug 30, 2012 at 8:10 PM, stl wrote: > Hello all, > if I try to boot Linux 2.6.37 by supplying a configuration file to the > kernel to create initramfs_data.cpio, > (without any compression), is it normal that the k

Re: need some clarifications concerning rootf mounting

You haven't build your root file system. I believe we give path to root file system in CONFIG_INITRAMFS_SOURCE. There are different ways to build root file system, like buildroot. http://buildroot.uclibc.org/ -Rahul B. On Thu, Aug 16, 2012 at 3:01 PM, stl wrote: > Thanks for your answer. > > Ok,

Re: Android jelly bean mounting problem

It seems that modules related to ext4 are not loaded. BTW what are these logs ? On Tue, Aug 14, 2012 at 4:23 PM, sandeep kumar wrote: > Hi all, > We are facing one issue, > > 3>EXT4-fs (mmcblk0p12): VFS: Can't find ext4 filesystem > [5.943134] EXT4-fs (mmcblk0p12): VFS: Can't find ext4 files

Re: need some clarifications concerning rootf mounting

On Tue, Aug 14, 2012 at 3:45 PM, stl wrote: > I have dug a little more, and if I well understand, the > initramfs_data.cpio.gz should be > expanded from __initramfs_start (defined in vmlinux.lds.S) > > But when and how is it done? > And by who? > Architecture specific code? bootloader, or setup_ar

Re: Regarding Ethernet support for kernel 3.4.7 debugging via KGDB‏‏

On Thu, Aug 9, 2012 at 4:12 PM, Vivek Panwar wrote: > Hi, > > I am making a set up for kernel debugging at remote location with the help > of ethernet, but as i heard that we dont have ethernet support in kernel 3.x > series , Is it true? I can not believe ethernet support is not in 3.x series! T

Re: What is purpose of /init

Sorry! and what is meant by exec 0/dev/console On Thu, Aug 2, 2012 at 12:04 PM, Rahul Bedarkar wrote: > Thanks Richard ! > > And what is > exec 0 exec 1>/dev/console > > On Thu, Aug 2, 2012 at 5:24 AM, richard -rw- weinberger > wrote: >> On Wed, Aug 1, 2012 at

Re: What is purpose of /init

Thanks Richard ! And what is exec 0/dev/console On Thu, Aug 2, 2012 at 5:24 AM, richard -rw- weinberger wrote: > On Wed, Aug 1, 2012 at 4:03 PM, Rahul Bedarkar wrote: >> Hi, >> >> I just saw contents of /init on my system. >> >> #!/bin/sh >> # devtmpfs

What is purpose of /init

Hi, I just saw contents of /init on my system. #!/bin/sh # devtmpfs does not get automounted for initramfs /bin/mount -t devtmpfs devtmpfs /dev exec 0/dev/console exec 2>/dev/console exec /sbin/init $* Can someone explain what is meant for ? Regards, Rahul B. __

Re: system stucks in run_init_process

, Jul 30, 2012 at 11:44 PM, Mulyadi Santosa wrote: > Hi... > > On Mon, Jul 30, 2012 at 9:27 PM, Rahul Bedarkar wrote: >> Hi, >> >> I have disabled CONFIG_DEVTMPFS in kernel config and system stucks in >> run_init_process call which is called after freeing initmem.

system stucks in run_init_process

Hi, I have disabled CONFIG_DEVTMPFS in kernel config and system stucks in run_init_process call which is called after freeing initmem. Any idea why this is happening. If devtmpfs is enabled, it runs normally. I am using 3.3.2 kernel. Thanks, Rahul B.